The digestive juices have powerful action, but it is probable that part of the protein escapes and certain particles pass into the circulation, thus effecting a true antigen injection, which can thus set off the leucocyte reaction.

The giant leucocyte, after a few months, tends to break up into the original, uncontrollable type; and about half the time, if that process is permitted to reach completion, the new cells no longer act even as inefficient defenders; they attack, instead, and the victim dies of leukemia.

Degeneration and death of cells, haemorrhages, serous and fibrinous exudations, leucocyte emigration, proliferation of connective tissue and other cells, may be mentioned as some of the fundamental changes.

Physical Economics treats of the internal affairs of the body; the whole machinery and how it works; all organs, members, functions; each last and littlest capillary and leucocyte, are parts of that "economy."